[PATCH 14/17] lustre/ptlrpc: re-enqueue ptlrpcd worker

From: Liang Zhen osc_extent_wait can be stuck in scenario like this: 1) thread-1 held an active extent 2) thread-2 called flush cache, and marked this extent as "urgent" and "sync_wait" 3) thread-3 wants to write to the same extent, osc_extent_find will get "conflict" because this extent

[PATCH 14/17] lustre/ptlrpc: re-enqueue ptlrpcd worker

From: Liang Zhen liang.z...@intel.com osc_extent_wait can be stuck in scenario like this: 1) thread-1 held an active extent 2) thread-2 called flush cache, and marked this extent as urgent and sync_wait 3) thread-3 wants to write to the same extent, osc_extent_find will get conflict